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First 'unhackable' quantum network
Published on: 2017-07-11
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033Tests on system in Jinan in Shandong province complete and service for nearly 200 users to begin next month.


China's first citywide commercial communications system using "unhackable" quantum technology is expected to be up and running next month.

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Tests on the system in Jinan in the east province of Shandong had been completed and the network would start operations next month to provide extremely secure communication for nearly 200 users.


Zhou Fei, assistant to the director at the Jinan Institute of Quantum Technology, said the first users would be in the government, military, finance and electricity sectors.


The quantum network uses particles of light to encrypt information. If a third party tries to intercept the information, the particles change characteristics, making it impossible to steal the information without alerting the network. It is understood to be impossible for any computer to decipher a message encrypted by a quantum key.

031The network will initially be restricted to nearly 200 users, mostly those working in government and finance.


China built its first large-scale quantum communication network in Hefei, Anhui province, in 2012. Work finished last year on the world's longest land-based quantum link between Beijing and Shanghai, while a number of other big cities including Wuhan, are also building their own quantum networks.


Though also as touted commercially viable, these systems were at least in part sharing existing optical fibre lines with traditional telecommunications networks. The "hybrid" structure might compromise security in some cases.

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A quantum simulation laboratory under the Chinese Academy of Sciences. The Jinan network was an "exclusive" system delicated to quantum communications.


But the Jinan network was an "exclusive" system dedicated to quantum communications. The information exchange between two users was protected by more than 4,000 qubits per second to achieve "absolute secrecy".


The network had more than 50 rounds of tests at terminals in Jinan government agencies and various Communist Party offices. The users were spread across several hundred square kilometres, and the test results were "satisfactory", the report said.


China last month announced its quantum satellite has successfully distributed a pair of entangled photons to two stations on land.

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